Define "paid". Money changing hands? Favor exchanged? Partnership? Quid-pro-quo?
There's no way Google can tell if an individual link is paid. What they can do is look for unnatural linking patterns, which they do already. Too many same text links, too fast, is likely to raise a flag.
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I have a few friends using PPP and one of them has got her blog banned because of this
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How do you
know this was the reason?